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introduction：Kinematic pair An active connection in which two members of a mechanism interact with each other in a certain relative motion。Most of the kinematic pairs studied in mechanism science refer to the active connection of direct contact﹐And assume a pair of contact points called kinematic subelements﹑A line or surface has a perfectly accurate geometry﹐However, in mechanical dynamics and mechanism accuracy, material elasticity and fabrication are considered﹑Assembly error and other practical factors。 The classification methods of motion pairs are﹕According to the contact﹐Low pair with surface contact and high pair with point or line contact。The former are shafts and bearings[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）Its in the mechanical transmission process
2015-03-15 Reading quantity 2789
introduction： bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]The common quality defects of parts after heat treatment are：Quenching microstructure overheating、underheating、Quenching crack、Insufficient hardness、Heat treatment deformation、Surface decarburization、Soft spot scheduling。 1.superheating The microstructure after quenching can be observed on the rough edges of bearing parts
2015-03-15 Reading quantity 1400
introduction：Cooling food is like freezing food，The application of refrigeration is steadily increasing in countries around the world，But the pace of development is painfully slow。One reason for this slowness，It is often thought to be related to social public infrastructure, or the lack thereof。The first is that the distribution system is very simple，The sale of frozen products is achieved through the existing system at room temperature，That would inevitably defrost the product in transit，The main purpose is to get the food distributed in time。Although there is a limit to how far you can travel at this stage，But the product does not undergo cooling or freezing than at the beginning of the distribution chain，The haul distance is longer。 This constant development
2015-03-15 Reading quantity 2864
introduction：bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]The use factor mainly refers to the installation adjustment、Service and maintenance、Whether the maintenance and repair meet the technical requirements。On the basis ofINABearing mounting、Use、maintenance、Technical requirements for maintenance，In operationINAThe load borne by the bearing、Rotational speed、Operating temperature、Vibration、Noise and lubrication conditions are carried out
2015-03-15 Reading quantity 1585
introduction：paikongqifa Air vent valve air valve A valve used in a water supply line to automatically discharge air（See picture[The structure of the exhaust valve]）。It is installed vertically on top of the pipe。When the pipe is filled with water，The air in the pipe can be discharged through the exhaust port，After filling，float（It is usually a float）Close the exhaust port under buoyancy，Stop the discharge of water。When the pipe drains，The float drops with the water level of the pipe，Exhaust open，The air then enters the pipe，To prevent the formation of vacuum in the pipeline。When the pipe is working properly，The air contained in the water will gradually separate out and rise，
2015-03-15 Reading quantity 2781
introduction：Suzhou Senrui Fresh-keeping Equipment Co., Ltd. is a high-tech enterprise specializing in the research and development of food and vegetable fresh-keeping packaging equipment，The company uses the general manager Mr. Lu Jinyan original invention of a number of national patents（Gas displacement techniqueZL01217028.3、Composite gas automatic mixing technologyZL02263582.3）And fresh gas activation know-how（device），Experiment and test of Food and Packaging Engineering Institute of Nanjing Agricultural University，Successfully developed a series of composite air conditioning fresh-keeping packaging machine，Fill the gap in the field of domestic food preservation，To solve the problem of food fruit and vegetable preservation,Enable me
2015-03-15 Reading quantity 2788
introduction： Issued by the National Development and Reform Commission2005Year control10No.（Overall control84No.）announcement,Give permission to168Term standard。among，The standards related to the instrumentation industry are as follows： No. Standard No. Standard name replaces standard No. Approval Date Revision Date Implementation date 8GB/T15969.3-2005Programmable controller control3section：Programming languageGB/T15969.3-19951995-12-292005-07-292006-02-01 9GB/T7665-2005General terms for sensorsGB/T7665-19
2015-03-15 Reading quantity 2875
introduction：（one）Characteristics of forging production。 The heated metal material is forged into tools of various shapes、Mechanical parts or blanks，So-called forging。Forging can change the internal structure of metal materials，Fine crystal，Improve its mechanical properties。Because forging is squeezed in the hot state of metal materials、pressure、forging、molded，Therefore, high temperature exists in the production process、smoke、Vibration and noise hazard factors，Scalding can occur if you are a little careless、Machine tool injuries and fire accidents。 Forging production must use heating equipment、Forging equipment and many auxiliary tools。 The main heating equipment is flame furnace（Oil stove、Gas stove
2015-03-15 Reading quantity 1501
introduction：Automobile bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]The seal is to make the bearing maintain good lubrication conditions and normal working environment，Give full play toKOYObearing[KOYObearing:kOYOBearings are generally required to bear large loads，Often without a cage，Instead, fill the inner and outer raceways with rolling elements。And most
2015-03-15 Reading quantity 1522
introduction： influenceINAbearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]Service life can have many factors，The main factors used for adjustment are installation，Use and maintenance，Maintenance and repair，And so must meet the technical requirements。According to the mounting of bearings，Use，upkeep，Maintenance techniques require the operation of a high speed turbine dental drill
2015-03-15 Reading quantity 1542
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